Just an update now that the Pep Rally has come and gone:
It was a Classic Nick theme!!!!!The student council members and senior class advisors all had LOTHT team t-shirts on

(Where they got them from, I don't know)
Let's see if I can remember who wore what:
Silver Snakes: Advisor 1 (The shirt itself was gray, though

)
Purple Parrots: Treasurer
Orange Iguanas: Advisor 2
Green Monkeys: Vice President
Blue Barracudas: Secretary
Red Jaguars: President
And, aside from LOTHT, here's a list of the classic Nick shows I remember being mentioned:
Doug
Ren and Stimpy
GUTS
Figure It Out
Slimetime Live
Salute Your Shorts
Kenan and Kel
There might have been 1 or 2 more, but I can't remember any of them if that's the case.
What a way to enjoy your last high school pep rally!